Method of Sections

Krazer101

Is it possible to use method of sections on a frame or only on trusses? I have a frame that opposes a horizontal load and to find the forces in each member, I used method of sections. Is this right or is the only way to solve the forces is by analysis of each member.

Mech_Engineer

When you say frame, do you mean the connection points between each member are fixed in both rotation and translation (e.g. they are moment connections)?

Topher925

Method of sections only works if your structure is entirely composed of two-force members. This also holds true for the method of joints. If your structure contains moments or the assumption of only two-force members is not valid, then neither method will work and you will need to look at more complex methods (finite element).

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Krazer101	Method of Sections Tweet Is it possible to use method of sections on a frame or only on trusses? I have a frame that opposes a horizontal load and to find the forces in each member, I used method of sections. Is this right or is the only way to solve the forces is by analysis of each member.

Mech_Engineer Blog Entries: 2 Recognitions: Gold Member Science Advisor	When you say frame, do you mean the connection points between each member are fixed in both rotation and translation (e.g. they are moment connections)?

Topher925	Method of sections only works if your structure is entirely composed of two-force members. This also holds true for the method of joints. If your structure contains moments or the assumption of only two-force members is not valid, then neither method will work and you will need to look at more complex methods (finite element).